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RG_100508411-Visitor
1-Visitor
November 24, 2021
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Trigonometry

  • November 24, 2021
  • 2 replies
  • 3973 views

Hello,

 

Right, mathcad and trig do not seem to be living a harmonious lifestyle. I ask why?

 

I'm going through some fairly basic questions for an assignment for school and again on paper everything is rosy, but then mathcad is unconvinced. 

I am seeming unable to input the inverse trig functions in any form which I know (sin^-1, asin) and then as you can see in question 8 in the file attached the answer is absolutely wrong.

 

What's the issue?! Is it me? Admittedly quite possible but I think I have tried all of the obvious approaches but I am likely wrong.

 

thank you in advance for any help which you can offer me!

 

Much MathCad love,

Rowan 

Best answer by rgunwaldsen

In addition to Stuart's excellent reply, you should consider using units wherever possible to eliminate conversion errors.  Prime 7 and PDF attached. (hope my high school trig is OK)

2 replies

S
StuartBruff23-Emerald V
23-Emerald V
November 24, 2021
@RG_10050841 wrote:

Hello,

 

Right, mathcad and trig do not seem to be living a harmonious lifestyle. I ask why?

 

I'm going through some fairly basic questions for an assignment for school and again on paper everything is rosy, but then mathcad is unconvinced. 

I am seeming unable to input the inverse trig functions in any form which I know (sin^-1, asin) and then as you can see in question 8 in the file attached the answer is absolutely wrong.

 

What's the issue?! Is it me? Admittedly quite possible but I think I have tried all of the obvious approaches but I am likely wrong.

 

Mathcad trig functions expect angles to be in radians.   Fortunately, you can tell Mathcad you mean degrees by simply adding the "deg" unit after your angles' numeric values.

 

2021 11 24 H.png

 

Stuart

    S
    StuartBruff23-Emerald V
    23-Emerald V
    November 24, 2021

    ... forgot to add.

     

    You need to type in "deg" whenever you need the answer in degrees.  Mathcad does not remember what you want.  If you don't, then you'll get the answer in radians; for example:

     

    2021 11 24 I.png

     

    If you're not sure of the name of the unit you require, then Mathcad provides a helpful list in the Units tab of the Math ribbon

     

    2021 11 24 J.png

     

    You can find more information about units and how to use them in the Mathcad Help pages.

     

    https://support.ptc.com/help/mathcad/r7.0/en/index.html#page/PTC_Mathcad_Help%2Fto_insert_units.html%23

     

    Stuart

      R
      rgunwaldsen15-MoonstoneAnswer
      15-Moonstone
      November 24, 2021

      In addition to Stuart's excellent reply, you should consider using units wherever possible to eliminate conversion errors.  Prime 7 and PDF attached. (hope my high school trig is OK)

        P
        ppal_25568718-Opal
        18-Opal
        November 25, 2021

        muser_0-1637801958658.png

         

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